Just found out some of the rarest coins in the world are literally worth millions. Like, we're talking finding a coin in your grandparent's attic that could set you up for life kind of money.

So apparently the US has been minting coins since 1793, and back in the day they used actual gold and silver. The crazy part? Most people don't realize how valuable these old coins became. A 1933 Double Eagle just sold for almost $19 million. The 1974 Flowing Hair Silver Dollar? Over $10 million. These aren't even the oldest ones either.

What makes certain coins so valuable comes down to rarity basically. The fewer coins that survived, the more collectors will pay. Like there's this 1792 Silver Center Cent that was originally worth just 1 penny. Only about 25 of them exist today, and one sold for $2.5 million. The 1913 Liberty Head Nickel? Only 5 were ever made, and it fetched $4.56 million at auction.

The rarest coin in the world right now seems to be the 1822 Capped Head Half Eagle - only 3 known to exist, and the record sale hit $8.4 million. Then there's the 1804 Class I Draped Bust Silver Dollar at $7.68 million, and the 1861 Double Eagle Paquet Reverse at $7.2 million. These are insane numbers for something that originally cost like $1 or $20.

Material composition matters too. Most of these rarest coins in the world are gold or silver-based, which adds to the appeal. But honestly it's all about scarcity at the end of the day.

Makes you think about all those old coins people have sitting around. Probably worth checking if you've got anything vintage in a drawer somewhere.